Line pressure control with input shaft torque measurement

摘要

A method of controlling a line pressure in a transmission is provided. Line pressure in a transmission is set to a pressure value including a first term that is proportional to an input torque value. The first term has a coefficient of proportionality that is increased in response to a signal indicating clutch slippage. The input torque value is a measured input torque value in a steady-state condition. The input torque value may be a maximum of the measured input torque value and a driver demand torque value in a transient condition.

主权项

1. A method of controlling a transmission comprising:
supplying a fluid at a pressure to engage a clutch; periodically adjusting the pressure in proportion to an input torque value based on a coefficient of proportionality between pressure and torque; and in response to a signal indicating slip of the clutch, increasing the coefficient of proportionality such that the pressure is increased for all positive input torque values.